Emergency-door lock.



H. G. VOIGHT.

EMERGENCY DOOR LOCK.

APPLICATION FILED rmms, 1911.

Patented May 21, 1912.

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EMERGENCY DOOR LOOK.

APPLICATION FILED rmms, 1911.

Patented May 21, 1912.

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8 wuewfoz UNITED STATES PATENT OFFICE.

HENRY G. VOIGH'I, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE AMERICAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

EMERGENCY-DOOR LOCK.

Specification of Letters Patent.

Patented May 21, 1912.

To all whom it may concern:

Be it known that I, HENRY G. Vororrr, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Emergency Door Locks, of which the following is a full, clear, and exact description.

My invention relates to improvements in emergency door locks, the object of said in vention being to provide a reliable locking mechanism for such exit doors as are used in the event of emergency, said lock being so arranged that pressure toward the door from the inside is bound to release the lock to ermit the door to swing open.

11 the drawings Figure 1 is a front view of the main features of my improved lock construction as the'same would appear from the inner side of a door. Fig. 2 is a plan view of part of the lock, shown partially in section. Fig. 3 is a plan view of certain other parts of the locking mechanism also shown partially in section. Fig. 4 is in the main a sectional view of the parts shown in the upper portion of Fig. 1. Fig. 5 is a side view of the parts shown at the lower portion of Fig. 1.

1 represents an operating rod which is arranged to extend horizontally across the face of the door and in such a position that, in the event of a panic, said bar will be encountered by the people moving toward the door and will be pressed thereby in a direction to release the look, so that the door may swing outwardly. The bar 1 is suitably connected, as by a crank 2, to a shaft 3, mounted in suitable bearings or brackets. l represents one of these brackets, the same being located adjacent to the crank 2. 5 is another of these brackets, "the same, in this instance, being located on the door close to the floor. The lower end of the rod 3 carries What I will term the latch pin 6, the surface of which is preferably formed by an anti-friction roller. In this particular form the latch pin 6 is mounted on a crank 7 on shaft 3.

8 is a stationary pin arranged to be mounted on the floor on a suitable support 9. The support 9 preferably carries a stop shoulder 10 for the purpose hereinafter described.

11 is a spring detent, the nose of which preferably takes into a recess in the end of a shouldered part 12 carried by the rod 3 to frictionally hold the rod 3 in its normal locking position.

In the drawings, the various parts are shown in the position in which the door is locked.

In Fig. 5, 14 conventionally represents part of a door and 15 the floor. The door is arranged to swing outwardly or to the left as it appears in Fig. 5. It is obvious that the latch pin 6, so long as it stands directly behind the fixed pin 8, will hold the door 14 from being swun open. The moment, however, the crank is turned in the direction indicated by the arrow. in Fig. 3, said pin 6 will move past a center line intersecting the axis of shaft 3 and pin 8, whereupon pressure against the inside of the door will cause said door to swing open. In order to shift the pin 6 to this unlocking position, it requires but comparatively slight pressure against the bar 1, for it is apparent that pressure against the bar 1 moves it toward the door and rotates the shaft 3 in a direction to effect this unlocking movement. By preference, when the door is locked, the center of the latch pin described is slightly out of line with the center of the pin 8 and shaft 3, being slightly to the right or past the centers of the parts 3 and 8, as viewed in Fig. 3.

Any suitable positive stop mechanism may be provided, if desired, to limit the swinging movement of the crank 7 in a direction opposite to that indicated by the arrow in Fig. 3, one suitable stop for that purpose being the shoulder 10 previously described. The frame or support 9 for the pin 8 may be of semi-circular outline, as shown in Fig. 3, the curved edge being beveled, as indicated at 16, to prevent the danger of tripping. It should be understood that a similar locking arrangement to that shown at the lower part of Fig. 1 may be provided at the upper end of the shaft 3, so as to lock the door both above and below, but since the upper fitting would correspond to the lower, no description thereof is neces sary. In some instances of course, it would be quite sufiicient to lock the door either at the top or bottom instead of at both places. Indeed, it would be equally appropriate to apply the stop pin to the side of the door casing instead of at the top or bottom, such modification being too obvious to require separate illustration or further description.

It will be seen that by no possibility can there be any hang to the latch pin, since the round surfaces of the coacting stop and latch pins will aid when one has passed the center of the other in releasing the door when pressure is applied thereto. Again it will be observed that, so far as the movable parts bear one upon another, all sliding engagement is dispensed with, rotary engagement throughout being substituted as requiring less power to operate and less danger of binding or cramping.

What I claim is:

1. In an emergency door look, a rotatable bar arranged to be carried at the inner side of a door, a crank pin on said bar, the center of said pin being normally between the center of the bar and the door, a stop pin arranged to be carried by the door casing,

said crank pin being arranged to engage the remote side of said stop pin relatively to the door, and an operating bar connected to said rotatable bar to rotate the same in a direction to dislodge said crank pin from said. stop pin.

2. In an emergency door lock, a rotatable bar arranged to be carried by a door, a crank pin on said bar arranged between the center of said bar and the door, a stop pin arranged to be carried by the door casing, a stop also arranged to be carried by the door casing, said crank pin being arranged to engage the remote side of said stop pin, said stop cooperating to hold said crank pin in position just beyond a line intersecting the axis of the stop pin and the bar, and means for rotating the bar by pressure toward the door to dislodge said crank pin.

HENRY Gr. VOIGHT.

Witnesses M. S. VIARD, H. J. BROWNE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

